Browsing Naturhistorisk museum by Title

Now showing items 623-642 of 763

  • Spectral analysis to improve inputs to Random Forest and other boosted ensemble tree-based algorithms for detecting NYF Pegmatites in Tysfjord, Norway 
    Santos, Douglas; Cardoso-Fernandes, Joana; Lima, Alexandre; Müller, Axel; Brönner, Marco; Teodoro, Ana Cláudia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    As an important source of lithium and rare earth elements (REE) and other critical elements, pegmatites are of great strategic economic interest for present and future technological development. Identifying new pegmatite ...
  • Sperm adaptation in relation to salinity in three goby species 
    Lindström, Kai; Havenhand, Jon; Leder, Erica Helen; Schöld, Sofie; Svensson, Ola; Kvarnemo, Charlotta (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    In externally fertilizing species, the gametes of both males and females are exposed to the influences of the environment into which they are released. Sperm are sensitive to abiotic factors such as salinity, but they are ...
  • Sperm divergence in a passerine contact zone: Indication of reinforcement at the gametic level 
    Albrecht, Tomas; Opletalová, Kamila; Reif, Jiri; Janousek, Vaclav; Pialek, Lubomir; Cramer, Emily Rebecca A; Johnsen, Arild; Reifova, Radka (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Postcopulatory sexual selection may promote evolutionary diversification in sperm form, but the contribution of between‐species divergence in sperm morphology to the origin of reproductive isolation and speciation remains ...
  • Sperm head abnormalities are associated with excessive omega-6 fatty acids in two finch species feeding on sunflower seeds 
    Støstad, Hanna Nyborg; Rowe, Melissah; Johnsen, Arild; Tomasek, Oldrich; Albrecht, Tomas; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    In a rapidly changing world, it is important to understand how urban environments impact wildlife. For example, supplementary feeding of birds, though well‐intended, might have unexpected negative effects on the health of ...
  • Sperm head abnormalities are more frequent in songbirds with more helical sperm: A possible trade-off in sperm evolution 
    Støstad, Hanna Nyborg; Rowe, Melissah; Johnsen, Arild; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Sperm morphology varies enormously across the animal kingdom. Whilst knowledge of the factors that drive the evolution of interspecific variation in sperm morphology is accumulating, we currently have little understanding ...
  • Sperm head morphology is associated with sperm swimming speed: a comparative study of songbirds using electron microscopy 
    Støstad, Hanna Nyborg; Johnsen, Arild; Lifjeld, Jan Terje; Rowe, Melissah (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Sperm exhibit extraordinary levels of morphological diversification across the animal kingdom. In songbirds, sperm have a helically shaped head incorporating a distinct acrosomal membrane or “helical keel,” the form and ...
  • Sperm length divergence as a potential pre-zygotic barrier in a passerine hybrid zone 
    Cramer, Emily Rebecca A; Grønstøl, Gaute; Maxwell, Logan; Kovach, Adrienne; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The saltmarsh sparrow Ammospiza caudacuta and Nelson's sparrow A. nelsoni differ in ecological niche, mating behavior, and plumage, but they hybridize where their breeding distributions overlap. In this advanced hybrid ...
  • Sperm length variation among Afrotropical songbirds reflects phylogeny rather than adaptations to the tropical environment 
    Omotoriogun, Taiwo Crossby; Albrecht, Tomas; Gohli, Jostein; Horák, David; Johannessen, Lars Erik; Johnsen, Arild; Kreisinger, Jakub; Marki, Petter Zahl; Ottosson, Ulf; Rowe, Melissah; Sedlacek, Ondrej; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Sperm cells vary tremendously in size and shape across the animal kingdom. In songbirds (Aves: Passeri), sperm have a characteristic helical form but vary considerably in size. Most of our knowledge about sperm morphology ...
  • Sperm morphology and function in passerine birds: insights from intra- and interspecific studies 
    Laskemoen, Terje (Doctoral thesis / Doktoravhandling, 2010)
    Sperm cells are the most variable animal cells, and a tremendous variation in sperm phenotypes exists among species, from minute amoeboid sperm to giant sperm in some species of fruit flies. Much effort has been devoted ...
  • Sperm morphology and performance in relation to postmating prezygotic isolation in two recently diverged passerine species 
    Poignet, Manon; Baránková, Lucie; Reif, Jiri; Stopka, Pavel; Stopková, Romana; Frolikova, Michaela; Cramer, Becky; Johnsen, Arild; Kverek, Pavel; Osiejuk, Tomasz S.; Komrskova, Katerina; Albrecht, Tomas; Reifova, Radka (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Divergence in sperm phenotype and female reproductive environment may be a common source of postmating prezygotic (PMPZ) isolation between species. However, compared to other reproductive barriers it has received ...
  • Sperm morphology, sperm motility and paternity success in the bluethroat (Luscinia svecica) 
    Sætre, Camilla Lo Cascio; Johnsen, Arild; Stensrud, Even; Cramer, Emily Rebecca A (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Postcopulatory sexual selection may select for male primary sexual characteristics like sperm morphology and sperm motility, through sperm competition or cryptic female choice. However, how such characteristics influence ...
  • Sperm Numbers as a Paternity Guard in a Wild Bird 
    Rowe, Melissah; van Oort, Annabel; Brouwer, Lyanne; Lifjeld, Jan Terje; Webster, Michael S.; Welklin, Joseph F.; Baldassarre, Daniel T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Sperm competition is thought to impose strong selection on males to produce competitive ejaculates to outcompete rival males under competitive mating conditions. Our understanding of how different sperm traits influence ...
  • Sperm performance in conspecific and heterospecific female fluid 
    Cramer, Emily Rebecca A; Stensrud, Even; Marthinsen, Gunnhild; Hogner, Silje; Johannessen, Lars Erik; Laskemoen, Terje; Eybert, Marie-Christine; Slagsvold, Tore; Lifjeld, Jan Terje; Johnsen, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Divergent sexual selection within allopatric populations may result in divergent sexual phenotypes, which can act as reproductive barriers between populations upon secondary contact. This hypothesis has been most tested ...
  • Sperm performance limits the reproduction of an invasive fish in novel salinities 
    Green, Leon; Niemax, Jan; Herrmann, Jens-Peter; Temming, Axel; Behrens, Jane W.; Havenhand, Jon; Leder, Erica Helen; Kvarnemo, Charlotta (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Aim The few fish species able to reproduce across wide osmotic ranges either plastically acclimate sperm performance to, or are locally adapted to, different salinities. The invasive round goby (Neogobius melanostomus) ...
  • Sperm size evolution in African greenbuls (Passeriformes: Pycnonotidae) 
    Omotoriogun, Taiwo Crossby; Albrecht, Tomas; Hořak, David; Laskemoen, Terje; Ottosson, Ulf; Rowe, Melissah; Sedlacek, Ondrej; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2016)
    Sperm morphology is highly diversified across the animal kingdom and recent comparative evidence from passerine birds suggests that postcopulatory sexual selection is a significant driver of sperm evolution. In the present ...
  • Spontaneous formation of prebiotic compartment colonies on Hadean Earth and pre-Noachian Mars 
    Köksal, Elif; Põldsalu, Inga; Friis, Henrik; Mojzsis, Stephen J; Bizzarro, Martin; Gözen, Irep (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Prominent among the models for protocells is the spherical biosurfactant shell, freely suspended in aqueous media. This model explains initial, but not subsequent events in the development process towards structured ...
  • Stauropoctonus bombycivorus (Gravenhorst, 1829) in Norway (Hymenoptera, Ichneumonidae, Ophioninae) 
    Hansen, Lars Ove; Berggren, Kai; Sørlibråten, Ove (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)
    The conspicuous icneumonid fly Stauropoctonus bombycivorus (Gravenhorst, 1829) is recorded for the first time in Norway. Four specimens have been captured in light-traps at three different localities in 2007: Hvaler in ...
  • Stereopsidales - A new order of mushroom-forming fungi 
    Sjökvist, Elisabet; Pfeil, Bernard E.; Larsson, Ellen; Larsson, Karl-Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    One new order, one new family, and one new combination are presented, as the result of molecular phylogenetic analyses. The new order Stereopsidales and the new family Stereopsidaceae are described incorporating Stereopsis ...
  • Stratigraphy and age of the Grippia niveau bonebed, Lower Triassic Vikinghøgda Formation, Spitsbergen 
    Hansen, Bitten Bolvig; Hammer, Øyvind; Nakrem, Hans Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We report on a newly excavated Spathian (Lower Triassic) bonebed on Marmierfjellet, Central Spitsbergen. The bonebed contains a varied material of bones and teeth from marine vertebrates along with conodont elements. The ...
  • Strong and lasting impacts of past global warming on baleen whales and their prey 
    Cabrera, Andrea A.; Schall, Elena; Berube, Martine; Anderwald, Pia; Bachmann, Lutz; Berrow, Simon; Best, Peter B.; Clapham, Phillip J.; Cunha, Haydée A.; Dalla Rosa, Luciano; Dias, Carolina P.; Findlay, Kenneth P.; Haug, Tore; Heide-Jørgensen, Mads-Peter; Hoelzel, A. Rus; Kovacs, Kit M.; Landry, Scott; Larsen, Finn; Moreira Lopes, Xenia; Lydersen, Christian; Mattila, David K.; Oosting, Tom; Pace III, Richard M.; Papetti, Chiara; Paspati, Angeliki; Pastene, Luis A.; Prieto, Rui; Ramp, Christian; Robbins, Jooke; Sears, Richard; Secchi, Eduardo; Silva, Monica A.; Simon, Malene; Vikingsson, Gísli A.; Wiig, Øystein; Palsbøll, Per J. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Global warming is affecting the population dynamics and trophic interactions across a wide range of ecosystems and habitats. Translating these real-time effects into their long-term consequences remains a challenge. The ...